Technical Solution For Bamboo Charcoal Fiber/Polyethylene Composite Decking
Technical solutions:
The preparation process of bamboo charcoal fiber-polyethylene composite flooring includes the following steps:
Step 1: Send ultrafine bamboo charcoal, high-density polyethylene, and mixing aids into a high-mixer to mix to obtain a mixture;
Step 2: Send the mixture into a screw extruder, and perform melt extrusion under the condition of an external constant magnetic field to obtain a composite material;
Step 3: The composite material is sent to an injection molding machine to be melted, and then cooled and shaped in the mold to obtain a floor covering; wherein the mixing aid is a coupling agent containing metal ions with magnetic response. In order to improve the interfacial compatibility between ultrafine bamboo charcoal and high-density polyethylene, a technical method of compounding a magnetically responsive coupling agent and applying a constant magnetic field was used.
The principles for adopting the above technical solutions include:
Under the condition of an external constant magnetic field, the carbon atoms in the ultra-fine bamboo charcoal are bonded into a ring structure, and an induced magnetic moment is generated under the action of the magnetic field.
And the induced magnetic moment rotates under the action of an external magnetic field, eventually causing the carbon layer of ultrafine bamboo charcoal to be oriented in the direction perpendicular to the magnetic field;Similarly, high-density polyethylene is a non-polar material that produces an induced dipole moment under the action of a magnetic field in the molten state.As a result, the spherulites are elongated along the direction of the magnetic field and tend to directional crystallization.Under the traction of an external magnetic field, a "whisker-like" additional crystallization zone is formed at the front edge of the crystallization zone, and the radial lamellae change from twisted growth to straight growth;Finally, the metal ion coupling agent is arranged in a direction parallel to the crystal axis with the largest magnetic susceptibility under the action of a magnetic field.
In this way, when ultrafine bamboo charcoal, metal ion coupling agent, and high-density polyethylene are melted and mixed,Under the influence of a magnetic field, the directionally distributed ultrafine bamboo charcoal is more likely to enter the high-density polyethylene with the same directional crystallization.The gap between high-density polyethylene and ultra-fine bamboo charcoal is reduced, and the interface bonding force between high-density polyethylene and ultra-fine bamboo charcoal is strengthened under the series connection of metal ion coupling agent.It plays the role of "stitching" the cross-linked network, ultimately making the high-density polyethylene have a better coating effect on the ultra-fine bamboo charcoal, greatly improving the mechanical properties of the composite material.
